Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations of Fermion Pair Production / Precision Predictions for (Un)stable W+W- Pairs

摘要

We present the new Coherent Exclusive Exponentiation (CEEX), in comparison tothe older Exclusive Exponentiation (EEX) and the semi-analytical InclusiveExponentiation (IEX), for the process e+e- -> f-bar f + n(gamma),f=mu,tau,d,u,s,c,b, with validity for centre of mass energies from tau leptonthreshold to 1 TeV. We analyse 2f numerical results at the Z-peak, 189 GeV and500 GeV. We also present precision calculations of the signal processes e+e- ->4f in which the double resonant W+W- intermediate state occurs using ourYFSWW3-1.14 MC. Sample 4f Monte Carlo data are explicitly illustrated incomparison to the literature at LEP2 energies. These comparisons show that a TUfor the signal process cross section of 0.4 percent is valid for the LEP2 200GeV energy. LC energy results are also shown.